考虑电压-气压的电-气耦合综合能源系统静态稳定域研究

Yunfei Mu, Zhibin Liu, Xiangwei Guo, Hongjie Jia, Kai Hou, Xiaodan Yu, Bofeng Luo, Hairun Li

工程（英文） ›› 2024, Vol. 36 ›› Issue (5) : 132-145.

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工程（英文） ›› 2024, Vol. 36 ›› Issue (5) : 132-145. DOI: 10.1016/j.eng.2023.12.009
研究论文
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考虑电压-气压的电-气耦合综合能源系统静态稳定域研究

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The Static Stability Region of an Integrated Electricity-Gas System Considering Voltage and Gas Pressure

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摘要

在电-气耦合综合能源系统（IEGS）中，负荷的波动不仅会影响电力系统中的电压水平，也同样影响天然气系统中的气压水平。在电力系统中，静态电压稳定域(SVSR)是分析其静态电压稳定性的一种有效途径。然而，由于IEGS中天然气系统的气压可能先于电力系统的电压崩溃，传统基于SVSR的静态稳定性分析方法评估结果往往过于乐观，难以直接应用于IEGS中。为此，本文将SVSR的概念拓展至IEGS中，提出了一种综合考虑电压-气压的IEGS静态稳定域(IEGS-SSR)分析方法。首先，借鉴电力系统的静态电压稳定边界准则，提出了天然气系统的静态气压稳定边界准则。在此基础上，给出了IEGS-SSR的定义，即在天然气发电机（NGU）有功功率注入空间下，一组满足多能流（MEF）等式约束、静态电压及气压稳定约束的运行点的集合。为求解IEGS-SSR的边界，本文提出了一种连续多能流（CMEF）算法，用以追踪特定NGU有功出力增长方向下的IEGS静态稳定边界点，进而提出了一种可均匀采样NGU有功出力增长方向的多维超平面抽样方法。求取的边界点将进一步通过Delaunay三角剖分法拟合三维空间中的IEGS-SSR边界。最后，本文通过算例结果验证了所提方法在刻画IEGS-SSR边界的有效性，并可为IEGS的在线监测与调度提供有力支撑。

Abstract

In an integrated electricity-gas system (IEGS), load fluctuations affect not only the voltage in the power system but also the gas pressure in the natural gas system. The static voltage stability region (SVSR) method is a tool for analyzing the overall static voltage stability in a power system. However, in an IEGS, the SVSR boundary may be overly optimistic because the gas pressure may collapse before the voltage collapses. Thus, the SVSR method cannot be directly applied to an IEGS. In this paper, the concept of the SVSR is extended to the IEGS-static stability region (SSR) while considering voltage and gas pressure. First, criteria for static gas pressure stability in a natural gas system are proposed, based on the static voltage stability criteria in a power system. Then, the IEGS-SSR is defined as a set of active power injections that satisfies multi-energy flow (MEF) equations and static voltage and gas pressure stability constraints in the active power injection space of natural gas-fired generator units (NGUs). To determine the IEGS-SSR, a continuation MEF (CMEF) method is employed to trace the boundary point in one specific NGU scheduling direction. A multidimensional hyperplane sampling method is also proposed to sample the NGU scheduling directions evenly. The obtained boundary points are further used to form the IEGS-SSR in three-dimensional (3D) space via a Delaunay triangulation hypersurface fitting method. Finally, the numerical results of typical case studies are presented to demonstrate that the proposed method can effectively form the IEGS-SSR, providing a tool for IEGS online monitoring and dispatching.

关键词

电-气耦合综合能源系统 / 静态稳定域 / 连续多能流 / 多维超平面抽样

Keywords

Integrated electricity-gas system / Static stability region / Continuation multi-energy flow / Multidimensional hyperplane sampling

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Yunfei Mu, Zhibin Liu, Xiangwei Guo. 考虑电压-气压的电-气耦合综合能源系统静态稳定域分析方法. Engineering. 2024, 36(5): 132-145 https://doi.org/10.1016/j.eng.2023.12.009

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